Toshiba HWT-601XWHM3W-ETR - 8-4.Diagnosis Flow Chart for each Error Code; 8-4-1.Hydro Unit Failure Detection

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8-4. Diagnosis flow chart for each error code
8-4-1. Hydro unit failure detection
[A01] Flowing quantity error
Built-in circulation
pump rotates
Pump is connected
to board
Flow rate
detected by flow sensor
is almost same as
actual value
Pump stops
2-3 minutes after its
rotation started
Remove waste
Dirt clogging inside
water circuit
12M or longer water
pipe to a branch,
5 or less branches
Fit buffer tank and
the second pump
Connect pump
connector to board
(Identify causes, and resolve)
Excess air noise
comes from inside
the pump
Yes
Yes
[A01] occurs
Operation restarts
Check water heat exchange
control board
If defective, replace it
PC board
MCC-1753
Perform air vent
Flow shortage
No
No
No
No
Replace the pump
Yes
Yes
No
Yes
Replace the flow sensor